<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>v-on指令</title>
</head>
<body>
    <div id="app">
        <button v-on:click="doIt">v-on按钮</button>
        <button @click="doIt">v-on按钮</button>
        <input type="button" value="双击事件" @dblclick="doIt">
        <h2 @click="changeFood">{{food}}</h2>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    <script>
        let app = new Vue({
            el:"#app",
            data:{
                food:"炒面"
            },
            methods:{
                doIt:function () {
                    alert("点击事件！");
                },
                changeFood:function () {
                    this.food += "真好吃!"
                }
            }
        })
    </script>
</body>
</html>